Dd to /dev/sda instead of /dev/sdb, how to restore /dev/sda

Hello,
yesterday I made a mistake, I did a dd to /dev/sda:
dd if=imagefile.img of=/dev/sda
Problem is my /dev/sda is my harddisk and it should have been /dev/sdb (usbstick).
Now my computer doesn't boot anymore.
How can I restore my harddisk without losing my data? The image file I copied was around 120MB.
Did dd than only overwrite the first 120MB or is there more?
Regards,
Roel

Thank You guys,
my arch-linux is up and running again in aprox. 1,5h time!!
First I tried to backup the harddisk with knoppix and saw my harddisk was empty, in gparted it seemed like it was never used... I was down, down, down... I didn't give up and downloaded systemrescuecd. Testdisk rstored my partition table and I saw it was my lucky day. The first partition on my harddrive was SWAP. All my files where intact and my stupid mistake only overwrote SWAP and MBR.
Reinstall grub would do the trick, i thought... but it didn't. Wy? Testdisk allocated my partitions to hda1 and hda2. In arch I had sda1 (swap); sda2 (/) and sda3 (/home). Now when I reinstalled grub the partition table didn't correspond to the ona in arch. A little bit fiddling in menu.lst, fstab and devices.map managed me to boot my arch system from fallback. My normal boot doesn't work though, I already changed everything to the right partitions but it keeps complaining about not finding my root partition. I already tried root=/dev/hda1; /sda1 and the whole rimram.
Can somebody tell me what's the problem?
It is probably my initrd file, isn't it?

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Dd to /dev/sda instead of /dev/sdb, how to restore /dev/sda

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